SY89843UMG

Signal Switches, Multiplexers, Decoders Overview

The SY89843UMG is a Precision LVPECL Runt Pulse Eliminator (RPE) 2:1 multiplexer with 1:2 fanout and internal termination. It operates from a 2.5V ±5% or 3.3V ±10% supply within an industrial temperature range of –40°C to +85°C. The device supports frequencies up to 2.0 GHz, featuring propagation delays under 880 ps and rise/fall times below 190 ps. It delivers 65 fs RMS phase jitter and accepts differential inputs as small as 100 mV via unique 3-pin termination architecture.

Signal Switches, Multiplexers, Decoders Feature Summary

• Unique patent-pending Runt Pulse Eliminator (RPE) circuit prevents short cycles during switchover
• Fail-Safe Input protection prevents metastable conditions when selected input clock fails to DC voltage
• Internal 3-pin termination architecture allows direct interface to AC- or DC-coupled signals without external resistors
• Ultra-low jitter design minimizes crosstalk-induced noise

Signal Switches, Multiplexers, Decoders Applications

• Redundant clock switchover
• Failsafe clock protection
• LAN/WAN infrastructure
• Enterprise servers
• ATE and test and measurement equipment

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix for packaging requirements; UMG indicates QFN-24 tube, while UMGTR indicates tape and reel. Confirm RoHS compliance status and lead finish specifications against current manufacturer documentation before finalizing procurement orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for applications requiring glitch-free redundant clock switching. Ensure input signal amplitudes meet the minimum 100mV requirement for proper operation of the internal termination. Verify that the operating frequency remains within the specified limits for guaranteed AC performance across the full industrial temperature range.

Signal Switches, Multiplexers, Decoders Part Context

The SY89843U belongs to Micrel's Precision Edge product line, designed for high-speed, low-jitter signal processing. This specific model integrates multiplexing capabilities with advanced pulse elimination features, distinguishing it from standard multiplexers by its ability to handle asynchronous clock transitions without generating runt pulses.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SY89844U (LVDS version), SY89845U (CML version). These related products share similar functional architectures but differ in input/output signaling standards.